时间域激发极化法各向异性介质响应分析

Analysis of the response of anisotropic media in the time-domain induced polarization method

随着激发极化法在多个领域越来越多的应用,实际勘探工作对该方法提出了更高的解释要求,即更准确,更符合实际介质属性。介质的电性各向异性是普遍存在的,但在实际资料解释中以往忽略极化率的各向异性。为了研究各向异性介质的响应特点,采用有限单元法求解点源场问题,进而使用等效电阻率法完成对极化率任意各向异性介质TDIP的正演模拟,通过对多个模型的模拟,研究了简单模型和带各向异性倾角的模型的响应特点,为了解各向异性响应和反演工作打下基础。

With the increasing application of the induced polarization method in many fields,exploration work puts forward higher interpretation requirements for this method,that is more accurate and more in line with the actual media properties.The electrical anisotropy of the medium is universal,but the anisotropy of the polarizability has been neglected in the actual data interpretation in the past.In order to study the response characteristics of anisotropic media,this paper uses the finite element method to solve the point source field problem,and then uses the equivalent resistivity method to complete the TDIP forward simulation of anisotropic media with arbitrary polarizability.Through the simulation of multiple models,the response characteristics of the simple model and the model with anisotropic inclination are studied,which lays the foundation for understanding the anisotropic response and inversion.